03813nam 22005775 450 991025460190332120200701062041.03-319-63901-310.1007/978-3-319-63901-7(CKB)3710000001631592(MiAaPQ)EBC4935644(DE-He213)978-3-319-63901-7(PPN)203851552(EXLCZ)99371000000163159220170802d2017 u| 0engurcnu||||||||rdacontentrdamediardacarrierEffective Field Theories for Heavy Majorana Neutrinos in a Thermal Bath[electronic resource] /by Simone Biondini1st ed. 2017.Cham :Springer International Publishing :Imprint: Springer,2017.1 online resource (221 pages)Springer Theses, Recognizing Outstanding Ph.D. Research,2190-5053"Doctoral Thesis accepted by the Technical University of Munich, Germany."3-319-63900-5 Includes bibliographical references at the end of each chapters and index.Baryon Asymmetry in the Early Universe -- Baryogenesis via Leptogenesis -- Effective Field Theories -- Thermal Field Theory in a Nutshell -- EFT Approach for Right-handed Neutrinos in a Thermal Bath -- CP Asymmetries at Finite Temperature: the Nearly Degenerate Case -- CP Asymmetries at Finite Temperature: the Hierarchical Case -- Flavoured CP Asymmetries.This thesis discusses the construction of an effective field theory (EFT) for non-relativistic Majorana fermions, shows how to use it to calculate observables in a thermal medium, and derives the effects of these thermal particles on the CP asymmetry.  The methods described in this thesis are the only ones to date that allow a systematic and effective description of the non-relativistic dynamics of a heavy Majorana fermion at finite temperature. The CP asymmetry is studied for hierarchical and nearly degenerate heavy-neutrino masses and the analysis includes the treatment of lepton-flavor effects.  Heavy Majorana neutrinos are involved in many scenarios of physics beyond the standard model and, in the leptogenesis framework, they are at the root of the baryon asymmetry in the Universe. Besides simplifying existing results, the EFT approach provides useful tools for addressing even more involved observables. Indeed, taken together, the approach and the material pres ented here represent an important step toward a systematic improvement of our knowledge of the CP asymmetry in heavy-neutrino decays at finite temperature.Springer Theses, Recognizing Outstanding Ph.D. Research,2190-5053Elementary particles (Physics)Quantum field theoryCosmologyString theoryElementary Particles, Quantum Field Theoryhttps://scigraph.springernature.com/ontologies/product-market-codes/P23029Cosmologyhttps://scigraph.springernature.com/ontologies/product-market-codes/P22049Quantum Field Theories, String Theoryhttps://scigraph.springernature.com/ontologies/product-market-codes/P19048Elementary particles (Physics).Quantum field theory.Cosmology.String theory.Elementary Particles, Quantum Field Theory.Cosmology.Quantum Field Theories, String Theory.410.72Biondini Simoneauthttp://id.loc.gov/vocabulary/relators/aut819574BOOK9910254601903321Effective Field Theories for Heavy Majorana Neutrinos in a Thermal Bath1826454UNINA